Influenza: Wisconsin Data

Weekly influenza case counts are organized by flu season.

The weekly respiratory report retired on May 23, 2025. All information from the weekly respiratory report will be found in the respiratory virus data visualizations for the upcoming respiratory season.

View past reports by choosing a season or see the table listing all reports.

• 2024-25 flu season began reporting on October 5, 2024
• 2023-24 flu season began reporting on October 21,2023
• 2022-23 flu season began reporting October 1, 20223
• 2021-22 flu season began reporting July 3, 2021
• 2020-21 flu season began reporting October 17, 2020
• 2019-20 flu season began reporting October 5, 2019
• 2018-19 flu season began reporting October 13, 2018

For additional influenza data in Wisconsin, visit our webpages for respiratory virus data or influenza vaccine data.

For national data, visit the Centers for Disease Control and Prevention Flu Activity and Surveillance page.

Questions about influenza? Contact us!

Phone: 608-267-9003 | Fax: 608-261-4976

Weekly Respiratory Virus Data

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